经过一些试验，我弄清楚了如何充分了解生命周期，以调试我的应用程序并了解正在发生的事情。使用所有事件（包括onEnter，onExit，stateChangeSuccess和此处的
viewContentLoaded），可以使我对事件的发生情况有一个体面的了解，这种方式对代码的灵活性和针对性比书面生命周期更加灵活和具体。在应用程序模块的“运行”功能中，我放置了：

如果我第一次使用Angular和UI-router时就开始使用它，那么这段代码将节省我很多时间和混乱。UI路由器需要“调试”模式，默认情况下启用此功能。

$rootScope.$on('$stateChangeStart',function(event, toState, toParams, fromState, fromParams){
  console.log('$stateChangeStart to '+toState.name+'- fired when the transition begins. toState,toParams : \n',toState, toParams);
});
$rootScope.$on('$stateChangeError',function(event, toState, toParams, fromState, fromParams, error){
  console.log('$stateChangeError - fired when an error occurs during transition.');
  console.log(arguments);
});
$rootScope.$on('$stateChangeSuccess',function(event, toState, toParams, fromState, fromParams){
  console.log('$stateChangeSuccess to '+toState.name+'- fired once the state transition is complete.');
});
$rootScope.$on('$viewContentLoading',function(event, viewConfig){
   console.log('$viewContentLoading - view begins loading - dom not rendered',viewConfig);
});

/* $rootScope.$on('$viewContentLoaded',function(event){
     // runs on individual scopes, so putting it in "run" doesn't work.
     console.log('$viewContentLoaded - fired after dom rendered',event);
   }); */

$rootScope.$on('$stateNotFound',function(event, unfoundState, fromState, fromParams){
  console.log('$stateNotFound '+unfoundState.to+'  - fired when a state cannot be found by its name.');
  console.log(unfoundState, fromState, fromParams);
});